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Full text of "The Cambridge Natural History"

RUDIMENTARY VOCAL SACS

589

In  his   teeth   Man  differs by the  small   exaggeration of the

c

B

A

/

pl.                                               pi.

Flo. 284.—The hard palate, A, of a Caucasian; B, of a ITegro ; G, of an adult Orang-
Utan, showing the differences in shape of the bones. The pnLite of the Negro
represents a type transitional between that of the Caucasian and thnt of the Orang,
w:f, Maxilla ; pl, palatine ; jj.mx, preznaxilla. (From "Wiedershehu's Structure of
Man.)

canines, which hardly, if at all, differ in the two sexes,     There is

also a complete absence of a diastema.

The   teeth   are   also   on  the   whole

weaker    than   in   the    Anthropoids,

though  Hylobates is very human in

this particular.

There is a tendency in Man
towards the disappearance of the
upper outer incisors, and more
markedly still of the wisdom teeth,
which appear very late, and are
often imperfect. In a large number
of eases the tooth does not appear
at all. In the larynx there is 110
great development of the great
throat pouches of the Anthropoids.
The minute diverticula of that
organ, known to human anatomists
as the ventricles of Morgagni, alone
remain to testify to a former howl-

L 285.—Human Larynx in frontal
section, cr, Cricokl cartilage; sn,
sinus of Morgagni ; t.c, first
trachea! cartilage ; th> thyroid
cartilage. (From Wiedersheim's
Structure of Man.)

ing   apparatus   in  the   ancestors of Man.